be birds of a feather

To be very similar (to another person) in taste, preference, opinion, etc. I knew you and John would get along well. Given all the interests you share, it seemed pretty clear that you were birds of a feather. Janet and I have always been birds of a feather. There's very little that we don't agree on. Jenna and the new receptionist are both so organized and meticulous. They should work well together given that they're birds of a feather.